On Thursday, April 05, 2012, Lin Ming wrote: > On Thu, 2012-04-05 at 10:56 +0800, Aaron Lu wrote: > > Hi, > > > > On Thu, Apr 05, 2012 at 10:31:20AM +0800, Lin Ming wrote: > > > > > > > > The only situation where a device can be put into ACPI D3_hot (which is not > > > > the same as PCI D3_hot, mind you) is when: > > > > > > > > (1) There is _PR3 listing some of the device's power resources as "on". > > > > (2) The power resources listed by the _PR3 as "off" are turned off and the > > > > power resources listed by the _PR3 as "on" are left in the "on" state. > > > > > > I don't understand item (2): > > > > > > If the power resource is listed as "off", which means it's already > > > turned off. Then why should it be turned off again? > > > > Rafael, > > I think you misunderstand the meaning of _PR3. > > The _PR3 will evaluate a list of power resources, not two lists(one "on" > > list and one "off" list), as illustrated by Ming below. > > > > And for a device to be put to D3 hot, it should: > > 1 execuate _PS3 first if available > > 2 turn on all the power resources referenced by _PR3 > > 3 turn off all the power resources referenced by previous state But leave the ones listed by _PR3 in the "on" state, you mean? Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
